TY  - BOOK
AU  - Lancaster,F.Wilfrid  .
TI  - Information retrieval systems : characteristics, testing and evaluation / 
U1  - 025.04 
PY  - 1991///
CY  - New York : 
PB  - John Wiley , 
KW  - INFORMATION RETRIEVAL
N1  - Includes appendix, bibliography & index
ER  -